| Overall Rating | Silver |
|---|---|
| Overall Score | 64.62 |
| Liaison | Sarah Fortner |
| Submission Date | March 3, 2022 |
Carleton College
OP-5: Building Energy Efficiency
| Status | Score | Responsible Party |
|---|---|---|
|
5.52 / 6.00 |
Martha
Larson Manager of Campus Energy and Sustainbility Facilities |
Electricity use, performance year (report kilowatt-hours):
| kWh | MMBtu | |
| Imported electricity | 15,271,355 Kilowatt-hours | 52,105.86 MMBtu |
| Electricity from on-site, non-combustion facilities/devices (e.g., renewable energy systems) | 3,516,855 Kilowatt-hours | 11,999.51 MMBtu |
Stationary fuels and thermal energy, performance year (report MMBtu):
| MMBtu | |
| Stationary fuels used on-site to generate electricity and/or thermal energy | 71,938 MMBtu |
| Imported steam, hot water, and/or chilled water | 0 MMBtu |
Total site energy consumption, performance year:
Gross floor area of building space, performance year:
Floor area of energy intensive space, performance year:
| Floor area | |
| Laboratory space | 196,228 Square feet |
| Healthcare space | 550 Square feet |
| Other energy intensive space | 79,965 Square feet |
EUI-adjusted floor area, performance year:
Degree days, performance year:
| Degree days | |
| Heating degree days | 7,616 Degree-Days (°F) |
| Cooling degree days | 999 Degree-Days (°F) |
Total degree days, performance year:
Start and end dates of the performance year (or 3-year period):
| Start date | End date | |
| Performance period | July 1, 2020 | June 30, 2021 |
Total site energy consumption per unit of EUI-adjusted floor area per degree day, performance year:
Electricity use, baseline year (report kWh):
| kWh | MMBtu | |
| Imported electricity | 14,305,092 Kilowatt-hours | 48,808.97 MMBtu |
| Electricity from on-site, non-combustion facilities/devices (e.g., renewable energy systems) | 0 Kilowatt-hours | 0 MMBtu |
Stationary fuels and thermal energy, baseline year (report MMBtu):
| MMBtu | |
| Stationary fuels used on-site to generate electricity and/or thermal energy | 156,288 MMBtu |
| Imported steam, hot water, and/or chilled water | 0 MMBtu |
Total site energy consumption, baseline year:
Gross floor area of building space, baseline year:
Start and end dates of the baseline year (or 3-year period):
| Start date | End date | |
| Baseline period | July 1, 2007 | June 30, 2008 |
A brief description of when and why the energy consumption baseline was adopted:
The baseline corresponds with Carleton's first greenhouse gas inventory that was aided and verified by Sightlines, a facilities benchmarking and analysis firm.
Source-site ratio for imported electricity:
Total energy consumption per unit of floor area:
| Site energy | Source energy | |
| Performance year | 0.07 MMBtu per square foot | 0.12 MMBtu per square foot |
| Baseline year | 0.12 MMBtu per square foot | 0.18 MMBtu per square foot |
Percentage reduction in total source energy consumption per unit of floor area from baseline:
Documentation to support the performance year energy consumption figures reported above:
A brief description of the institution's initiatives to shift individual attitudes and practices in regard to energy efficiency:
Sustainability Assistants work on peer to peer education and outreach at New Student Week, in the residence halls, Climate Action Week, and other areas. The campus community is now very comfortable with common lighting controls like occupancy sensors and automatic dimming. The Energy Club assists with energy audits and hosts an annual energy symposium each year for the public.
A brief description of energy use standards and controls employed by the institution:
Campus standard is 68 degrees in winter 74 degrees in summer. Each week, Carleton's HVAC technicians enter the weekly classroom and office room schedule information into the Building Automation System so temperature setbacks can be employed during unoccupied hours. Maintenance staff work continuously to audit and improve the building automation systems in an effort to find further energy reduction opportunities.
A brief description of Light Emitting Diode (LED) lighting and other energy-efficient lighting strategies employed by the institution:
LED retrofit kits, 4ft. LED bulbs and new LED lights are now the standard for the Carleton maintenance department. Carleton is working through campus-wide LED lighting retrofits based on a list of projects from the Xcel Turn-Key Audit program. We completed bi-level LED stairwell fixtures, pin-style fixtures and exterior lighting retrofits. We are in the process of replacing all 4 ft. fluorescent bulbs with 4 ft. LED bulbs.
A brief description of passive solar heating, geothermal systems, and related strategies employed by the institution:
In summer 2021, Carleton completed its transition from district steam to low temperature hot water heating tied to geothermal heating and cooling. The fiscal year 2021 data represents half of that system coming online, so further reductions are anticipated as a year of data is logged post project completion. More information can be found here: https://apps.carleton.edu/geothermal/
A brief description of co-generation employed by the institution:
NA
A brief description of the institution's initiatives to replace energy-consuming appliances, equipment, and systems with high efficiency alternatives:
In FY19, Carleton completed turn-key energy audits with Xcel energy on 92% of our buildings. We have completed this and are now in the process of completing the recommended energy conservation opportunities.
Website URL where information about the institution’s energy conservation and efficiency program is available:
Additional documentation to support the submission:
Data source(s) and notes about the submission:
The information presented here is self-reported. While AASHE staff review portions of all STARS reports and institutions are welcome to seek additional forms of review, the data in STARS reports are not verified by AASHE. If you believe any of this information is erroneous or inconsistent with credit criteria, please review the process for inquiring about the information reported by an institution or simply email your inquiry to stars@aashe.org.